Method for stroboscopically examining repeating processes and arrangement for performing said method

Abstract

Apparatus for examining vocal folds and a method for operating said arrangement that avoid the large fluctuations in the image brightness of the camera system and thus the flickering, which is unpleasant for the user, is provided. The apparatus comprises a stroboscopic light source, a camera control unit having a camera head, a microphone, an optical waveguide, and an optical assembly, wherein the stroboscopic light source has a signal-conducting connection to the camera control unit, and the camera head is placed on the optical assembly, wherein the camera head and the microphone have signal-conducting connections to the camera control unit, and the optical assembly is connected to the light source by means of the optical waveguide.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a method for stroboscopically examining repeating processes, in particular for examining moving vocal folds, and to an arrangement for performing said method.[0002]The method of stroboscopy has been known for years. Various arrangements for observing / examining periodic processes of moving vocal folds are known, too. These arrangements include illumination units based on flash lamps or LEDs in combination with a CCD or CMOS camera system.[0003]The flash lamps or LEDs are triggered by the fundamental frequency of the voice thus producing a stationary image of the vocal folds (see FIG. 1) or, if the phases of the trigger signal are continuously shifted (0°-360°), a slowly moving image of the vocal folds (see FIG. 2).[0004]The disadvantage of these currently available examination arrangements based on stroboscopy instruments is the missing or imperfect synchronization or control of the illuminating flashes to the camera system. T...

AI Technical Summary

Benefits of technology

[0010]The aim of this invention is to provide a method for stroboscopically examining repeating processes, particularly for examining moving vocal folds, and an arrangement for performing said method that

Problems solved by technology

The disadvantage of these currently available examination arrangements based on stroboscopy instruments is the missing or imperfect synchronization or control of the illuminating flashes to the camera system.

This disadvantage causes fluctuations of the brightness of the camera system that are perceived by the user as an unpleasant flickering.

However, this method does not produce identically exposed single images and thus it does not avoid the image flickering because the constancy of the light quantity per single image is not guaranteed.

This method has the disadvantage that the constant quantity of light per single image is achieved by suppressing complete lightning impulses.

Said disadvantage can produce dark or considerably post-amplified and thus “noisy” video images, in partic

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